docs(agents): close W5 renderer surface wave

[blakinio]

Purpose

Close OTERYN-W5-RENDER-SURFACE durably after its plan, implementation and lifecycle archives merged.

Completed W5

• plan PR docs(agents): plan W5 renderer surface ownership #84 / archive PR docs(task): archive W5 renderer plan #85
• renderer PR feat(rust): add renderer surface ownership #86 / archive PR docs(task): archive renderer surface ownership #87
• renderer implementation merge: 247837ad405a79fe6d9a8d2bc18b86911a2dcefa
• renderer archive merge: 1bbbf5828d46684a38d5360c63c2d970a64014e1
• no active W5 worker task or shared-path lease remains

Closure changes

• mark W5 completed and prohibit relaunch of W1-W5 lanes;
• route the coordinator prompt to a separate post-W5 planning lifecycle only;
• record renderer PR feat(rust): add renderer surface ownership #86 as merged and archived by docs(task): archive renderer surface ownership #87;
• add the closure task and exact evidence;
• record exactly one next bounded recommendation without authorizing it.

Next recommendation, not authorization

A future coordinator may plan one small normalized synthetic asset schema/compiler slice under WS-R09. It must use synthetic/original fixtures only, produce deterministic bounded metadata/pack output, preserve provenance and hashes, and exclude runtime mounting, GPU/renderer integration, real proprietary importers, updater/download, protocol, UI and production compatibility claims.

No next worker task, implementation branch, dependency change, accepted wave or shared-path lease is created by this PR.

Scope

Exactly five documentation paths. No Rust source, Cargo, lockfile, dependency policy, CI, renderer, application shell, assets, legacy runtime, protocol or external-repository change.

Preserved blockers

Interactive Windows/GPU compatibility remains unproven. Proprietary asset redistribution and production Canary-compatible pack inputs remain blocked on rights and exact source-format evidence.